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error (0x8004010F) : 'Outlook data file cannot be accessed.'

Question

I've been an Outlook 2010 user for over a year. I haven't had any problems with setting up my accounts or sending & receiving emails till this past week. I'm now receiving an error message when the program tries accessing my email
accounts. The error message is as follows:
Sending' reported error (0x8004010F) : 'Outlook data file cannot be accessed.'I have opened up other PST files, same error.I go to the account settings and the "Test Account Settings" works. I have removed & re-installed Outlook.Even after re-installing, it Outlook remembers the old settings, Therefore
I still receive the same error message.

OK I now have a similar issue. I've had Outlook 2010 for about 18 months and have had few issues.

The OS is Vista 32bit and I run 2 outlook profiles, neither of which use an exchange server (both are pop3/smtp).

Yesterday, I changed one of the profiles, simply changing the setting to delete mail from server after x days. Since then, I am sudenly recieveing the same error as described above, but only for that profile (the other profile is still fine)

When I open outlook and select the relevant profile, then check the account settings, there is only one entry under the email tab, and only one entry under the data tab, yet strangely, the send/recieve seems to be trying to access two profiles - 'mail@domain'
and 'domain'. The send/recieve seems to work - i.e. I can send and recieve mails, yet still get this error.

I've deleted and recreated the profile, pointing the data file to the original pst and am still getting it.

Since the error code appears to relate to synchronising with an exchange server, and the profile does not reference exchange, why am I getting this error?

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